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N number of Setup and Hold violations

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phutanesv

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Dear Friend?

If i have n umber of Setup violationd and n number os hold vioations,

Which one to consider first ?
 

i think you have to consider worst setup violation bcos DC by default does not optimize the remaming parts of a design if critical path is still viloating timing(hence subcritical path is not optimized).
 

first setup and then after CTS go for hold
 

Hi phutanesv,

This question answer is already answered in forum,
Just check this



:D
 

Hai sameer,

i went thro taht, but i did not get a clear idea to fix which one first?

Someone are saying to fix setup first some to hold first,

but to my knowledge hold has to be fixed first,

what are the causes if i dont fix hold . Explain plssssssss?

phutanesv
 

Hi phutanesv,

You are right hold fixing before tapeout is must.

If you do not fix the hold your circuit will not work at all (Hold requirement does not depend upon frequency). If your have setup fails then still you can work at lower frequency.

So the flow is
1. fix the setup within your project shedule as much as you can
2. Finally signoff with all the hold fixed.

Anyway if system point of view both are important than fix both.

I hope this will help :D
 

after CTS only the rgt value of hold is obtained......which can be met just by adding buffers....
 

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